Trane R Series Installation Operation & Maintenance page 72

72
Installation - Electrical
Table 21 Input Values Vs. External Chilled Water Setpoint
Inputs
Resistance (Ohms) Current (ma)
944330 4.0
686092 5.2
52946 6.5
42434 7 .7
34889 8.9
29212 10.2
24785 11.4
21236 12.6
18327 13.8
15900 15.1
13844 16.3
12080 17 .5
10549 18.8
9050 20.0
2. Isolated 2-10 VDC Voltage Source Input.
Set DIP Switch SW1-1 of Options Module 1U2 to "OFF" . Connect the voltage
source to terminals TB1-4 (+) and TB1-5 (-) on Options Module IU2. CWS is
now based on the following equation:
CW Setpoint °F = (VDC x 8.125) - 16.25
Sample values for CWS vs. VDC signals are shown in
Minimum setpoint = 0 ° F(2.0 VDC input )
Maximum setpoint = 65 ° F ( 9.4 VDC input )
Maximum continuous input voltage = 15 VDC
Input impedance (SW1-1 off) = 40.1 Kohms
3. Isolated 4-20 mA Current Source Input.
Set DIP Switch SW1-1 of Options Module 1U2 to "ON" . Connect the current
source to terminals TB1-4 (+) and TB1-5 (-). CWS is now based on the
following equation:
Setpoint °F = (mA x 4.0625) - 16.25
Sample values for CWS vs., mA signals are shown in
Minimum setpoint = 0 ° F(40mA)
Maximum setpoint = 65 ° F (18.8 mA)
Maximum continuous input voltage = 30 mA
Input impedance (SW1-1 on) = 499 ohms
NOTE: The negative terminal TB1-5 is referenced to the UCM chassis
ground. To assure correct operation, 2-10 VDC or 4-20 mA signals must be
Resulting Chilled
Voltage (Vdc) Water Setpoint (F)
2.0 0.0
2.6 5.0
3.2 10.0
3.9 15.0
4.5 20.0
5.1 25.0
5.7 30.0
6.3 35.0
6.9 40.0
7 .6 45.0
8.2 50.0
8.8 55.0
9.4 60.0
10.0 65.0
Table 21.
Table 21.
RLC-SVX07A-EN